#include <iostream>
#include <header.h>
using std::cout;
using std::endl;

void swap(int &x, int &y){
    int tmp = x;
    x = y;
    y = tmp;    
}

void test0(){
    int a = 1;
    int b = 2;
    swap(a, b);
    cout << a << endl << b << endl;
}
int main(int argc, char* argv[]){
	ARGS_CHECK(argc, 1);
    test0();
	return 0;
}